Improvement in lifting-jacks



NrrEn STAE STEPHEN D. JONES, OF BLUE ISLAND, ILLINOIS.

IMPROVEMENT IN LlFTING-JACKS.

Specification forming part of Letters Patent No. 118,020, dated August15, 1871.

To all whom t may concern:

Be it known that I, STEPHEN D. JoNEs, of Blue Island, in the county ofCook and State of Illinois, have invented a new and useful Improvementin LiftingJacks 5 and I do decla-re that the following is a true andaccurate description thereof, reference bein g had to the accompanyingdrawin g and to the letters of reference marked thereon, and being apart of this specitication, in Which- Figure l is a side elevation ,ofmy invention, and Fig. 2 a horizontal section on the line a x of Fig. 1.

Like letters of reference made use of in the severa-l figures indicatelike parts.

To enable those skilled in the art to make and use my invention, I willproceed to describe the same With particularity, making use in so doing`of the aforesaid drawing.

A is an upright standard supported by a base or platform, B, which, ifdesired, may be mounted upon small Wheels or casters for convenience inmoving' about. O is movable or sliding fulcruin placed in front of thestandard, and connected thereto by a iiXed clamp or slide, d, claspinginto the vertical grooves D, one upon each side of the standard. Abail-shaped pawl, E, is pivoted to the standard at the point e, andsurrounds the fulcrum O and engages with its ratchet or notched face F,furnishing a means whereby the fulcrum may be adjusted to any 'desiredheight Within the limit of the mechanism to suit various sized vehiclesor other objects to be lifted. G is a lever, mortised, as indicated bydotted lines, to fit over the standard and fulcrum, and pivoted to thefulcrum at g. This lever is iitted with a check-pawl, H, which engageswith a ratchet, I, upon the rear face and upper extremity of thestandard, and serves to hold the lever in position after the lift ismade.

-The lifting-jack so constructed affords a simple, cheap, andexceedingly durable device, capable of being adjusted to any sizedvehicle without any detachment of its parts.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

The 'combination of the standard A having grooves D, the fulcrum C,clasps d, bail-shaped paWl E, ratchet F, lever G, pawl H, and ratchet I,all constructed and arranged substantially as described and shown. 4

" S. D. JONES.

Witnesses:

J. W. MuNDAY, J ULIUs WELCKE.

